If the audio is out by the same amount throughout the movie, try AviMux_Gui (free): http://www.alexander-noe.com/video/amg/ Drag and drop yoour movie into the top window, highlight it and select generate data. Now, in the bottom window. highlight audio and any delay will appear to the right. If anything other than 0 appears, select start naming and saving the new file as you wish and in a minute or 2 you will have a new file to use.